20545543340533 has 2 divisors, whose sum is σ = 20545543340534. Its totient is φ = 20545543340532.

The previous prime is 20545543340461. The next prime is 20545543340537. The reversal of 20545543340533 is 33504334554502.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20544616868689 + 926471844 = 4532617^2 + 30438^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20545543340533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20545543340537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10272771670266 + 10272771670267.

It is an arithmetic number, because the mean of its divisors is an integer number (10272771670267).

Almost surely, 2^{20545543340533} is an apocalyptic number.

It is an amenable number.

20545543340533 is a deficient number, since it is larger than the sum of its proper divisors (1).

20545543340533 is an equidigital number, since it uses as much as digits as its factorization.

20545543340533 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480000, while the sum is 46.

The spelling of 20545543340533 in words is "twenty trillion, five hundred forty-five billion, five hundred forty-three million, three hundred forty thousand, five hundred thirty-three".